蜡沉积凝析气-液-固微观渗流机理研究

根据渗流理论,对凝析气藏衰竭开发过程中反凝析气-液-固的渗流机理进行了实验研究,利用高温高压条件仿真微观可视化模型,模拟了地层凝析气-液-固的流动,直接观测了凝析油的流动特征,研究了凝析油气运移机理和流动方式,阐述了蜡沉积运移规律和凝析油-气-固变化特征和输送规律。研究结果表明,凝析油充填孔隙角隅和孔道,小孔隙充满连续流动,大孔道为溪状流,凝析液为贴壁流和溪流。凝析气-液-固在渗流过程中,蜡沉积吸附在多孔介质表面,并随气相进行悬浮流动和推移流动,同时蜡沉积在凝析液中也随凝析液流动。

Porous flow mechanism of multiphase complex flow of condensate gas reservoirs with wax deposition

The porous flow mechanism of gas-liquid-solid in depleted gas reservoir was studied experimentally on the basis of seepage flow theory. The high-temperature and high-pressure visual micro model was used to simulate the flow states of gas-liquid-solid in condensate gas reservoir. The phase change and wax deposition in the condensate gas reservoir were investigated. The results indicated that the condensate oil was accumulated easily in the small and stagnant pores, throat and surface of pores, but difficultly accumulated in the big pores. The condensate oil flows with crawls along the wall of pores and plug flow. The wax deposition flows in the form of suspension and moving with gas and condensate fluid.